coreys <coreys@xxxxxxxxxxxxxx> writes:
> When I try to upgrade my guest windows 8 vm to window 8.1. I get the
> error of processor doesn't support CompareExchange128. Haven not been
> able to find any information about this error.
I think that's because cmpxchg16b is not emulated yet:
static int em_cmpxchg8b(struct x86_emulate_ctxt *ctxt)
{
u64 old = ctxt->dst.orig_val64;
if (ctxt->dst.bytes == 16)
return X86EMUL_UNHANDLEABLE;
...
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